Answer:
x = - 4 , x = - 3
Step-by-step explanation:
- 7x = x^2 + 12
Take all terms to one side of equation.
x^2 + 7x + 12 = 0
Find which 2 numbers multiply to give 12 and add to give 7.
a × b = 12
a + b = 7
a = 4
b = 3
Split the middle term using these 2 numbers.
x^2 + 4x + 3x + 12 = 0
Factorise each pair of terms separately.
x ( x + 4 ) + 3 ( x + 4 ) = 0
Bring out common factor of ( x + 4 ) and factorise.
( x + 4 ) ( x + 3 ) = 0
Using the Null factor law, make the expressions in each pair of parentheses equal 0.
x + 4 = 0
x = - 4
AND
x + 3 = 0
x = - 3
THEREFORE:
x = - 4 , x = - 3
Answer:
your number is 18
Step-by-step explanation:
x^2 = (x × 10 ) + 144
x^2 = 10x + 144
x^2 - 10x - 144 = 0
using quadratic method
your answer should be
(x- 18) ( x+8 )
Descending Order:
a. 15, 8, 0, -2, -3, -5
b. 23, 12, 7, 6, 0, -11
c. 12, 11, 5, -1, -21, -31
d. 98, 56, 4, 0, -35, -53
Ascending (increasing) Order:
a. -333, -210, -26, -8, 0, 21, 33, 85, 2011
b. -8, -5, -1, 0, 4, 5
c. -7, -6, -3, 0, 2, 3, 4
d. -7, -3, -1, 0, 3, 8, 17
e. -10, -7, -6, 5, 6, 19
Answer:
Get a list of all the music students in the eighth grade. Randomly select enough students to get a sample from the population. Ensure that the selection is completely random so the sample is not biased.
